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Check out the size and weight of each 12V 100 Ah deep cycle battery. For reference, a Group 24 battery is usually 75 Ah, the size of a car battery, 45 pounds, and you shouldn’t discharge it below 50%, meaning it’s a usable 38 Ah. And a Group 24 at Wal Mart is $75. So $300 buys you a 180 pound...

Stock Rad charger is 48V, 2A, so 96 watts. To get equivalent charge rate, you‘d need 100+ watts of solar. Then you have to figure out charge controller that takes power from panel(s) and provides to battery at correct voltage. A 48V lithium-compatbile charge controller would be ideal...

I received an email from Rad that the August shipment of my RadRunner Plus may be pushed into September. Maybe not surprising, the supposed June shipment of a RadCity ST for my wife didn’t ship until mid July. Maybe the few extra weeks will get us into some cooler weather here in Texas.

If convenient, you might charge to 100% immediately before you ride and then leave in the partially-charged state until charging before your next ride. Lithium batteries degrade more quickly if kept in a fully-charged state. I cant’t say how much difference that would ultimately make on the...